I bought this item from you in the past and have never used it before and I'm ready to use it. What size of plastic water tubing do I need to connect ? Is it 1/4" ID the correct size ?? Do I need to buy a connector, too ? Thanks for your info.

Yes this attaches to 1/4 inch tubing. If you need to buy a pump already set up with 1/4 inch tubing connector we sell them here: https://www.hisglassworks.com/submersible-pump-for-grinders-and-core-drills.html If you wanted to attach the manifold tubing directly to a hose line we sell a kit here: https://www.hisglassworks.com/6-foot-1-4-inch-tubing-kit-push-connect-adaptor-and-hose-adaptor-html.html